/* ========== Reset & Base ========== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #1a1a2e;
  --accent: #0066cc;
  --accent-hover: #0052a3;
  --text: #333;
  --text-light: #666;
  --bg: #ffffff;
  --bg-alt: #f8f9fa;
  --border: #e9ecef;
  --tag-bg: #e8f0fe;
  --tag-text: #1967d2;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-hover: 0 4px 12px rgba(0,0,0,0.12);
  --sidebar-width: 240px;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* ========== Navigation ========== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
}

.navbar-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 50px;
}

.navbar-brand {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.02em;
}

.navbar-brand:hover {
  text-decoration: none;
  color: var(--accent);
}

.navbar-links {
  display: flex;
  gap: 1.6rem;
  list-style: none;
}

.navbar-links a {
  font-size: 0.85rem;
  color: var(--text-light);
  font-weight: 500;
  padding: 0.25rem 0;
  position: relative;
}

.navbar-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.25s;
}

.navbar-links a:hover {
  color: var(--accent);
  text-decoration: none;
}

.navbar-links a:hover::after {
  width: 100%;
}

/* ========== Page Layout (Sidebar + Main) ========== */
.page-layout {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  gap: 2.5rem;
  padding: 2rem 2rem 0;
  align-items: start;
}

/* ========== Sidebar ========== */
.sidebar {
  position: sticky;
  top: 62px;
  text-align: center;
  padding: 1.5rem 0;
}

.sidebar-photo {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--border);
  box-shadow: var(--shadow);
  margin-bottom: 1rem;
}

.sidebar-name {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.02em;
  margin-bottom: 0.2rem;
}

.sidebar-name-cn {
  font-weight: 400;
  color: var(--text-light);
  font-size: 1rem;
  display: block;
  margin-top: 0.1rem;
}

.sidebar-title {
  font-size: 0.82rem;
  color: var(--text-light);
  font-weight: 500;
  margin-bottom: 0.15rem;
}

.sidebar-affiliation {
  font-size: 0.82rem;
  color: var(--text);
  font-weight: 600;
}

.sidebar-divider {
  height: 1px;
  background: var(--border);
  margin: 1rem 0;
}

.sidebar-info {
  list-style: none;
  text-align: left;
}

.sidebar-info li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  color: var(--text-light);
  padding: 0.3rem 0;
}

.sidebar-info li svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  opacity: 0.6;
}

.sidebar-links {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  color: var(--text-light);
  padding: 0.35rem 0.5rem;
  border-radius: 6px;
  transition: all 0.2s;
}

.sidebar-link:hover {
  color: var(--accent);
  background: var(--bg-alt);
  text-decoration: none;
}

.sidebar-link svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  pointer-events: none;
}

/* ========== Main Content ========== */
.main-content {
  min-width: 0;
}

.main-section {
  padding: 1.5rem 0;
}

.main-section + .main-section {
  border-top: 1px solid var(--border);
}

.section-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.8rem;
  letter-spacing: -0.02em;
}

/* ========== Hero Bio (in main) ========== */
.hero-bio {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text);
}

.hero-bio p + p {
  margin-top: 0.6rem;
}

/* ========== Research Interests ========== */
.research-text {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text);
}

.research-list {
  margin: 0.5rem 0 0 1.2rem;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text);
}

.research-list li {
  margin-bottom: 0.4rem;
}

.research-list li strong {
  color: var(--primary);
}

/* ========== Experience (Horizontal) ========== */
.exp-horizontal {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  overflow-x: auto;
  padding-bottom: 0.3rem;
}

.exp-item {
  flex: 1;
  min-width: 140px;
  padding: 0.7rem 0.8rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  text-align: center;
  transition: box-shadow 0.2s, border-color 0.2s;
}

.exp-item:hover {
  box-shadow: var(--shadow-hover);
  border-color: #ccc;
}

.exp-item--active {
  border-color: var(--accent);
  background: var(--tag-bg);
}

.exp-company {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 0.1rem;
}

.exp-role {
  font-size: 0.75rem;
  color: var(--text-light);
  margin-bottom: 0.15rem;
}

.exp-date {
  font-size: 0.7rem;
  color: var(--text-light);
  font-variant-numeric: tabular-nums;
  opacity: 0.7;
}

.exp-arrow {
  font-size: 1rem;
  color: var(--text-light);
  flex-shrink: 0;
  opacity: 0.4;
}

/* ========== News ========== */
.news-list {
  list-style: none;
}

.news-item {
  display: flex;
  gap: 1rem;
  padding: 0.5rem 0;
  align-items: baseline;
}

.news-item + .news-item {
  border-top: 1px solid var(--border);
}

.news-date {
  font-size: 0.8rem;
  color: var(--text-light);
  font-weight: 500;
  min-width: 80px;
  font-variant-numeric: tabular-nums;
}

.news-text {
  font-size: 0.88rem;
  line-height: 1.6;
}

.news-highlight {
  color: #d63031;
}

.news-date--highlight {
  -webkit-animation: pulse-new 2s ease-in-out infinite;
  -moz-animation: pulse-new 2s ease-in-out infinite;
  animation: pulse-new 2s ease-in-out infinite;
}

/* ========== Publications ========== */
.pub-list {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.pub-card {
  padding: 1rem 1.2rem;
  background: var(--bg-alt);
  border-radius: 10px;
  border: 1px solid var(--border);
  transition: box-shadow 0.2s, border-color 0.2s;
}

.pub-card:hover {
  box-shadow: var(--shadow-hover);
  border-color: #ccc;
}

.pub-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 0.3rem;
  line-height: 1.5;
}

.pub-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  font-size: 0.82rem;
  color: var(--text-light);
}

.pub-meta strong {
  color: var(--text);
  font-weight: 600;
}

.pub-tag {
  display: inline-block;
  padding: 0.15rem 0.55rem;
  font-size: 0.72rem;
  border-radius: 12px;
  font-weight: 500;
}

.pub-tag--new {
  background: #ff9800;
  color: #fff;
  -webkit-animation: pulse-new 2s ease-in-out infinite;
  -moz-animation: pulse-new 2s ease-in-out infinite;
  -o-animation: pulse-new 2s ease-in-out infinite;
  animation: pulse-new 2s ease-in-out infinite;
}

@-webkit-keyframes pulse-new {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.95); }
}

@keyframes pulse-new {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.95); }
}

.pub-tag--venue {
  background: var(--tag-bg);
  color: var(--tag-text);
}

.pub-tag--citation {
  background: #fff3e0;
  color: #e65100;
}

.pub-tag--impact {
  background: #e8f5e9;
  color: #2e7d32;
}

/* ========== Blog Links ========== */
a.blog-link {
  display: block;
  color: var(--primary);
}

a.blog-link:hover {
  color: var(--accent);
  text-decoration: none;
}

/* ========== Footer ========== */
.footer {
  text-align: center;
  padding: 1.2rem 0;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--text-light);
}

/* ========== Mobile Hamburger ========== */
.navbar-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.navbar-toggle svg {
  width: 24px;
  height: 24px;
  color: var(--text);
}

/* ========== Responsive ========== */
@media (max-width: 860px) {
  .page-layout {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 0 1.2rem;
  }

  .sidebar {
    position: static;
    padding: 1.5rem 0 1rem;
    border-bottom: 1px solid var(--border);
  }

  .sidebar-photo {
    width: 120px;
    height: 120px;
  }

  .sidebar-info {
    text-align: center;
  }

  .sidebar-info li {
    justify-content: center;
  }

  .sidebar-links {
    flex-direction: row;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .exp-horizontal {
    flex-wrap: wrap;
  }

  .exp-arrow {
    display: none;
  }

  .exp-item {
    flex: 1 1 45%;
    min-width: 120px;
  }

  .navbar-toggle {
    display: block;
  }

  .navbar-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 50px;
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(12px);
    padding: 1rem 2rem;
    gap: 0.8rem;
    border-bottom: 1px solid var(--border);
  }

  .navbar-links.active {
    display: flex;
  }

  .main-section {
    padding: 1.2rem 0;
  }
}

@media (max-width: 480px) {
  .sidebar-name {
    font-size: 1.1rem;
  }

  .exp-item {
    flex: 1 1 100%;
  }
}